From random chopped to oriented continuous SiC fibers–ZrB2 composites
From random chopped to oriented continuous SiC fibers–ZrB2 composites
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DOI：
10.1016/j.matdes.2014.06.037
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发表时间：
2014-11
影响因子：
8.4
通讯作者：
D. Sciti;L. Pienti;A. Murri;E. Landi;V. Medri;L. Zoli
中科院分区：
文献类型：
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作者：
D. Sciti;L. Pienti;A. Murri;E. Landi;V. Medri;L. Zoli
以自制的一维织物预制体为原料，采用真空袋浸渗和热压工艺制备了ZrB2-连续碳化硅纤维复合材料。比较了短切碳化硅纤维增强复合材料的烧结行为和第二相、基体/纤维界面等微观结构特征。由于纤维的有序排列，渗透过程使总纤维含量最高可提高到40%。当纤维预制体被适当渗透时，复合材料几乎完全致密，致密化机理与未增强基体相同。与含有短不连续纤维的复合材料不同，纤维/基质界面的化学相互作用程度非常有限，这导致即使在没有纤维保护层的情况下，断裂表面也更容易拔出。
ZrB2–continuous SiC fiber composites were prepared by vacuum-bag infiltration and hot pressing, using homemade 1D fabric preforms of Tyranno SA3 SiC fibers. Sintering behavior and microstructural features such as secondary phases and matrix/fiber interface were compared to those of chopped SiC fibers-reinforced composites. The infiltration process allowed the overall fiber content to be increased up to 40 vol%, because of the ordered arrangement of fibers. When the fiber preforms were properly infiltrated, the composites were nearly fully dense and the densification mechanisms were the same as those of unreinforced matrices. Different from composites containing short discontinuous fibers, the degree of chemical interaction at the fiber/matrix interface was very limited and this resulted in an easier pull out in the fractured surfaces, even in absence of fiber protective coating.